English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The direct detection of MeV-scale dark matter (DM) particles hinges onachieving an exceptionally low energy detection threshold. Germanium (Ge)detectors, meticulously tailored with precise impurity compositions, hold thepotential to enhance sensitivity to energy levels below the sub-electronvolt(sub-eV) range. This study explores the behavior of residual impuritiesinherent to Ge detectors at helium temperatures, unveiling a captivatingfreeze-out phenomenon leading to the formation of excited localized statesknown as dipole states. Using compelling evidence from relative capacitancemeasurements obtained from two detectors, we elucidate the transition ofimpurity atoms from free charge states to these dipole states as thetemperature drops from 11 K to 6.5 K. Our investigation comprehensively coversthe intricate formation of these dipole states in both n-type and p-typeimpurities. Furthermore, we shed light on the electric field generated by thesedipole states, revealing their ability to trap charges and facilitate thecreation of cluster dipole states. Confirming findings from previousmeasurements, we establish that these excited dipole states exhibit a bindingenergy of less than 10 meV, offering an exceptionally low detection thresholdfor MeV-scale DM. Building upon this concept, we propose the development of a1-kg Ge detector with internal charge amplification, an innovative approachpoised to surpass electrical noise and enable the detection of MeV-scale DMwith unprecedented sensitivity.

Exploring the Potential of Residual Impurities in Germanium Detectors for Low-Mass Dark Matter Detection